Tri-Vallery Corp.

 OTC BB:DLKM.OB

News  Release


Mbwemkuru Alluvial Gold Deposit Update


VANCOUVER, May 20, 2008 – Harp Sangha, CEO/President of Douglas Lake Minerals Inc. (DLKM-OTCBB) provides the following update on the recently announced Mbwemkuru Alluvial Gold Deposit Property Licences in Southeastern Tanzania. With the recent visits to the property by TIGMR – Tianjin Geological Research Institute and the Northern China Geological Exploration delegation, as well several other company and consulting geologists, the company is able to provide a better assessment of Mbwemkuru's potential.

"We are extremely pleased with the acquisition of the 430 square kilometer Mbwemkuru Project which consists of four prospecting licenses. With economic grades between 1 and 5 grams and in some areas as high as 50g/t, we believe this property has the potential to be a world-class alluvial operation. The property is currently in production generating between 150 to 200 ounces of high grade gold per month with no mechanized mining equipment. With minimal investment the company's consulting mining engineers feel the property could be in early production generating as much as 100,000 ounces of gold per year", stated Harp Sangha. "The Mbwemkuru Project is well-located in SE Tanzania and easily accessible by dirt road 138 km from the district town of Nachingwea, and only 500 km from Tanzania's capital Dar es Salaam."

Excellent Mineralization Potential
The rocks in Mbwemkuru Project are mineralized with sulphides like arsenopyrite, visible gold and gemstones such as sapphire and galena. Gold mineralization in the sandy alluvial were observed to host free gold developed from weathering of existing bedrock which consists of garnet, chlorite, clays, silica and biotite rock. This material was transported and deposited on the trough at the time of the alluvial deposit. The gold grade in the alluvial deposit is as high as 50g/t in some areas.

Economic grades between 1 and 5 grams seem to be consistent throughout the area of approximately 22 km by 9 km. Grades seem to increase at depth and existing operations have not found bedrock with some pits as deep as 10 meters, suggesting a significant alluvial deposit.

Douglas Lake's geological team has completed initial systematic sampling of both alluvium and hard rock with test results expected by late June. Systematic sampling and mapping work continues.

Regional Geology
The Mbwemkuru Project is situated in low to high-grade metamorphosed rocks of Proterozoic age. The dominant rocks are biotite schist, granitic gnesis, garnetiferous amphibolite and quartzite. The Mbwemkuru Project lies at the east margin of the Selous Basin where Karoo and young sedimentary rocks are in fault contact with Proterozoic rocks. The regional structural trends that control the deposition appear to be trending at northwest and northeast.

Local Geology And Site Visit Observations
The Mbwemkuru Project is situated on a strongly faulted rock elevated up to 700m above sea level with the highest elevation observed being on the western part of the project. The project mainly consists of gneiss rocks that are covered with transported overburden. Three types of overburden materials were identified during the April to May 2008 visits. The overburden in the area consists of red brown silt soil, light gray sand soil, red brown sandy soil and black cotton soil (Mbuga).

This overburden extends to about 10m in depth on some localities and possibly deeper - drilling will determine the depth. The interface between the overburden and saprolite is hosted with angular to sub angular quartz fragments that indicate this horizon consists of transported materials. The saprolite material mainly consists of clays, chlorite garnet, and silica and biotite minerals. The saprolite in the project indicates that the bedrock has undergone low to high-grade metamorphism.

The area that hosts the source of Mbwemkuru River and its tributaries is elevated to about 700m above sea level and contains gravels that are euhedral to sub angular shapes. This indicates that the area contains no transported materials and could be one of the sources that created the alluvial deposit at the Mbwemkuru Project.

Douglas Lake's Conclusion
The Mbwemkuru Placer Deposit comprises a significant, but un-quantified accumulation of gold in alluvium hosted by: 1) reworked palaeo-placer by the Mbwemkuru River and its tributaries, and 2) an over 10m thick zone of palaeo-placer pebble beds non-conformably overlying biotite schist, gneiss, quartzite, garnet-amphibolite and granitoids. The latter comprises a poorly sorted palaeo-placer plateau extending over 24 km along a NE-SW direction and ~9 km wide along a NW-SE direction. In addition there are extensive troughs with similar continental alluvium further west in the Karroo Basin. Gold-bearing alluvium along the Mbwemkuru River occurs within a 0.35 to 1.80 m thick zone between the bedrock and sandy-gravelly material. This zone contains ~0.10 and 0.50 grams per cubic metre that the small-scale miners are currently recovering. The palaeo-alluvium on top of the hill overlooking Jinonje Valley returned better grades but an exact number was not determined. Samples were taken here as well and results will be released when they are returned from the lab.

The primary task from June 1, 2008 will be to delineate the economically processable alluvium gold deposits from the Mbwemkuru Placer Deposit, as no systematic exploration has yet been undertaken in the area. This will enable staff members to determine grade and tonnage complying with the widely accepted codes of Mineral Resource and/or Ore Reserve classifications.

About Douglas Lake
DLKM is an emerging mineral exploration company focused on exploring and developing gold, copper, nickel, uranium and diamond mining opportunities in Tanzania. DLKM has a portfolio of 55 prospecting concessions and is negotiating to acquire an additional 80. For more information go to www.douglaslakeminerals.com

This release contains forward-looking statements that involve risks and uncertainties. Complete forward-looking statement is available at www.douglaslakeminerals.com/forwardlooking.html

For further investor information:
Investor Relations
Pacific IR Corp.
415-119 W. Pender St.
Vancouver, BC, V6B 1S5
Tel: 604-734-7026
Toll free: 1-866-734-7026
Email: info@pacificircorp.com

Website: www.douglaslakeminerals.com
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